Q.21 The gas which turns limewater milky is
(A) carbon dioxide
(B) carbon monoxide
(C) ammonia
(D) nitrogen dioxide
Q.22 Which of the following is the lightest gas?
(A) hydrogen
(B) helium
(C) xenon
(D) radon
Q.23 Hydrogen is not found in atmosphere because
(A) It is highly inflammable
(B) It is the lightest gas
(C) It is absorbed by plants
(D) It immediately combines with oxygen to form water
Q.24 The gas used for filling weather balloons is
(A) Helium
(B) Hydrogen
(C) Air
(D) Nitrogen
Q.25 What is the chemical name of Laughing Gas?
(A) Silver nitrate
(B) Sodium carbonate
(C) Calcium sulphate
(D) Nitrous oxide
Q.26 The coloured discharge tubes for advertisement mainly contain
(A) Xenon
(B) Argon
(C) Helium
(D) Neon
Q.27 Which one of the following noble gases is not found in the atmosphere (negligible quantity)?
(A) Argon
(B) Krypton
(C) Radon
(D) Xenon
Q.28 For respiration in deep sea, divers use mixture of
(A) Oxygen and helium
(B) Oxygen and hydrogen
(C) Oxygen and carbon dioxide
(D) Oxygen and nitrogen
Q.29 Gases used to prepare Ammonia gas are
(A) Nitrogen and Oxygen
(B) Nitrogen and Oxide
(C) Nitrogen and Hydrogen
(D) Nitrogen and Carbon
Q.30 Which one of the following gases is opaque to outgoing terrestial radiation but transparent to incoming solar radiation?
(A) Oxygen
(B) Carbondioxide
(C) Nitrogen
(D) Helium
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